<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>列表类的操作</title>
</head>
<body>
<ul>
    <li>roy</li>
    <li>will</li>
</ul>

<ol>
    <li>roy</li>
    <li>will</li>
</ol>
</body>
</html>